FWIW, my Honda dealer here in Mpls told me the Honda brand 0W20 oil is SEMI-synthetic and NOT full synthetic. That seems logical to me because they charge $39 for a 0W20 oil change and to get full synthetic almost anywhere it cost you around $60 for an oil change. Full synthetic Mobil 1 0W20 cost $6.50 a quart at Walmart, so you are already over $33 just for the oil. Add labor and a good filter and your at the $60 mark.
Use only what Honda recommends which is SAE 0w20 Any major brand.
5w20 any premium brand. UNless you have a hybrid, the 0W20.
0w30
Yes. SAE 0W20 means that the oil has zero viscosity in winter. This oil does not exist, which is just as well because if it did it would drain right down into the sump leaving the engine unlubricated. Several companies make a SAE 0w20, including AMSOIL and Toyota. In cold temperatures the oil is thicker than at warm temperatures. Because it has a lower viscosity, it lubricates the engine faster than a higher viscosity oil. Toyota is specifying 0w20 next year.
Synthetic 0W20
not a good idea 0w20 is very thin oil. unless your engine calls for it it will go right through your piston ring & burn the oil. 10w 30 is a much thicker weight.
The Honda Odyssey passenger van has been in production for a number of years as of September 2014. Engine oil and fluid capacities will vary by model and production year, For the 2014 Odyssey with the 3.5L V6 the engine oil capacity with filter is 4.5 quarts. 0W20 and 5W20 are recommended for this application for all-season use.
5w20 or 0w20- either is ok by Toyota
The 2011 Toyota Camry takes SAE 0W20 motor oil. That is the best oil for that vechile.
Use Mobil 1 or equivalent.
Just use what Toyota recommends unless you live in a extremely cold place,then I'd go 0w20 because it flows better in the cold.